Gravitation Question 163
Question: Escape velocity on the surface of earth is $ [11.2,km/s] $ . Escape velocity from a planet whose mass is the same as that of earth and radius 1/4 that of earth is[CBSE PMT 2000; JIPMER 2002; BHU 2004]
Options:
A) 2.8 km/s
B) 15.6 km/s
C) 22.4 km/s
D) 44.8 km/s
Show Answer
Answer:
Correct Answer: C
Solution:
$ [v_{e}\propto \frac{1}{\sqrt{R}}] $ .
If R becomes $ [\frac{1}{4}] $ then $ [v_{e}] $ will be 2 times.
